Pollock out with left knee tightness

HOUSTON -- D-backs All-Star center fielder A.J. Pollock was out of the lineup in Saturday's 9-2 loss to the Astros and likely will also miss Sunday's game after experiencing tightness behind his left knee during Friday night's game.

Pollock had experienced some tightness when the team was in Seattle, but it felt a little worse when he ran to first base in the seventh inning Friday and he was removed later in the inning for a pinch-runner.

"It felt good today," Pollock said before Saturday's game. "I'm just going to take it slow and see what happens. Yeah, I'm swinging, doing everything. I think today they wanted me to take it off from running. Hopefully that will be it and I'll move on past it."

While Pollock will likely want to play in Sunday's series finale, D-backs manager Chip Hale wants to be cautious.

"We'd rather catch it now and give him two or three days off than have to put him on the DL and miss a month," Hale said.

Anderson to make rehab start Sunday

In other injury news, right-hander Chase Anderson, who is on the DL with right triceps inflammation, will make a rehab start Sunday in the Rookie Arizona League.

If Anderson gets through that outing while completing six innings or throwing 40 pitches the team will likely activate him to start next weekend against the Reds.

Anderson will take the rotation spot of rookie Zack Godley, who will start Monday against the Nationals. Godley threw just 55 innings last year in the Minor Leagues and has thrown 101 1/3 this year, so the team will have to closely monitor his workload from here on out.

It's possible the team could move Godley back into the bullpen soon -- either in the big leagues or the Minors -- as a way to limit his innings.